A popular site in Port Phillip Bay. No, it's not the remnants of an old volcano, but it looks like it. Popes Eye is the beginning foundation for a circular "fort" but was abandoned before completion. It is now a marine sanctuary, and home to a lot of gannets plus a seal or two.

The inside of the crater is a perfect calm and shallow (about 3m) spot to anchor a boat. The outer walls have become a really nice artificial reef for LOTS of colourful fish. It's an easy dive for most any certified diver.

Just watch out for the famous current! If you are not diving at slack water time, the current along the outer wall can be very strong. There are plenty of rock wall spots to hang on to though so make your way to the front or back areas out of the current.